Sewing machine



FIG. 1 is a perspective view of a sewing machine;

FIG. 2 is a front view thereof;

FIG. 3 is a left view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a right view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken line showing fasteners, flywheel, and additional parts is included for the purpose of illustrating environmental structure and forms no part of the claimed design. 

CLAIM The ornamental design for a sewing machine, as shown and described. 